X-rays are a focused beam of x-ray particles passed through bone which produce an image on special film, showing the structure through which it passed. This provides the familiar black and white images doctors and dentists use to diagnose problems and disease. Without an x-ray of the whole tooth and supporting bone and gum tissues, there would be no way to detect infection or pathology that requires attention. X-rays are a critical tool, along with the visual clinical exam that help the dentist properly diagnose conditions in your mouth.